Smith, M. R., & Collis, L. (1993). Aggregates: Sand, gravel and crushed rock aggregates for construction purposes (2nd ed.). London: Geological Society.
Παραπομπή Chicago StyleSmith, M. R., and L. Collis. Aggregates: Sand, Gravel and Crushed Rock Aggregates for Construction Purposes. 2nd ed. London: Geological Society, 1993.
Παραπομπή MLASmith, M. R., and L. Collis. Aggregates: Sand, Gravel and Crushed Rock Aggregates for Construction Purposes. 2nd ed. London: Geological Society, 1993.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.